Fire-door for furnaces



(No Model.)

J. W. BAKER.

FIRE noon FOR- FURNACES.

No. 329,693. Patented Nov; 3, 1885.

WITNESSES IJVVEJVTOR I M, 9m, W. (5mm .dttorneys N. PETERS, mailmm, Wmhlnflmg 0.6.

" UNITED STATES PATENT ()FFICEQ JOHN WESTLEY BAKER, OF BUNKER HILL, INDIANA.

FIRE-DOOR FOR FURNACES.

SPECIFICATION forming part of Letters Patent No. 329,693, dated November 3, 1885.

Application filed August 17, 1885. Serial ,No. 174,633. (No model.)

To all whom it may concern.-

Be it known that I, JOHN W. BAKER, a citizen of the United States, residing at Bunker Hill, in the county of Miami and State of 7 Indiana, have invented certain new and useful Improvementsin Fire-Doors for Furnaces; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

Figure l of the drawings is'a representation of afront elevation,partly in section. Fig. 2 is a side elevation with the boiler broken away, and Fig. 3is a bottom plan view of the door-operating mechanism.

This invention relates to fire-doors for furnaces, especially adapted to locomotive-furnaces; and it consists in the construction and novel combination of parts, as will be hereinafter fully described,and particularly pointed out in the appended claims.

Referring by letter to the accompanying drawings, A designates the rear end of the boiler; 13, the floor in the cab of the engine, and Othe furnace-door, which latter is connected to a vertical rod or pintle, D, working in bearings D D, secured to the front wall of the firebox D This rod D passes down through an opening in the floor of the cab, and is provided on its lower end with a crank, E, with which is connected one end of a rod, F, the other end of said rod F being bifurcated and connected by a short pivot-rod, F, to the upper end of an arm, G, the lower end of said arm G being keyed to the rock-shaft H, supported in bearings in the lower ends of hangers I I, secured to the under face of the cab-floor and projecting below it.

The rock-shaft H is also provided with a shorter arm, J, which is keyed thereto and projects at an angle of about ninety degrees fromthe arm G in the direction of the hinge rod or pintle D. The rock-shaft H can be bent around the axle,if desired,to give it more room. The outer end of the arm J is bifurcated at K, andin this bifurcation K is pivoted the lower end of the foot-rod L, which latter is made in two sections, L L, the meeting endsof which are rabbeted and pivoted together in order to give the connection slight play when the foot-rod is operated to open the furnace-door. The mreting ends of the foot-rod sections are rectangular in cross-section; but the portion of the foot-rod above the pivoted connection is cylindrical in cross-section and passes up through a middle opening in the cross-head M. The ends of the crosshead M are provided with holes M Mtthrough which guide-rods NN, with heads N at their lower ends, pass, the upper ends of said guide-rods N N, being secured in seats in the cab-floor. The rods N N are encircled by springs N N which operate to hold the door normally closed.

At one side of the door a keeper, 1?, is provided, and projects ashort distance from the face of the boiler-head. This keeper P is provided near its outer end with a notch, P, with which the pivoted latch Q, engages when it is desired to hold the furnace-door partially open.

The object in holding the door partially open is to cool the boiler when it becomes too hot. The latch Q is pivoted to the furnace door at about the center of the door.

To open the furnace-door, the fireman places his foot on a foot-plate, S, at the upper end of the foot-rod, and bears down thereon until he has replenished the fire-box. When the fireman removes his foot from the footplate, the springs N N" will operate to close the door automatically. The latch is only used to hold the door partially open, the springs serving to hold it closed when the latch is not in engagement with the notch.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent of the United States, is-

1. The combination,with the fire-box of the furnace having external hinge-bearings, of the door with the strap hinges, the pintle with the crank at its lower end, the pivoted connecting-rod with bifurcated end, the depending bearings, and rock-shaft with the longer and shorter "arms, the foot-rod .an'd foot-plate, andthe' guide-rods, and the springaotuated cross-head,substantially as specified.

2. The combination, with the boiler-head provided with the notched projecting keeper, of the hinged door with the pivoted latch, the

pintle with the crank at its lower end, the.

pivoted connecting-rod with the bifurcated end, the depending bearings, the rock-shaft 

